[PATCH] D122008: [flang][driver] Add support for generating executables

[Andrzej Warzynski via Phabricator via cfe-commits]

awarzynski created this revision.
awarzynski added reviewers: kiranchandramohan, clementval.
Herald added a subscriber: mgorny.
Herald added a reviewer: sscalpone.
Herald added projects: Flang, All.
awarzynski requested review of this revision.
Herald added subscribers: cfe-commits, jdoerfert.
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This patch adds 2 missing items required for `flang-new` to be able to
generate executables:

1. Extra linker flags to include Fortran runtime libraries.

2. The Fortran_main runtime library, which implements the main entry point into Fortran's PROGRAM.

With this change, you can generate an executable that will print `hello,
world!` as follows:

  $ cat hello.f90
  program hello
    write (*,*), "hello, world!"
  end program hello
  $ flang-new hello.f90
  ./a.out
  hello, world!

Note: Fortran_main was originally written by Peter Klausler, Jean Perier
and Steve Scalpone in the fir-dev` branch in [1].

[1] https://github.com/flang-compiler/f18-llvm-project

Co-authored-by: Peter Klausler <pklausler at nvidia.com>
Co-authored-by: Jean Perier <jperier at nvidia.com>
Co-authored-by: Steve Scalpone <sscalpone at nvidia.com


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122008

Files:
  clang/lib/Driver/ToolChains/Gnu.cpp
  flang/include/flang/Runtime/stop.h
  flang/runtime/CMakeLists.txt
  flang/runtime/FortranMain/CMakeLists.txt
  flang/runtime/FortranMain/Fortran_main.c
  flang/test/CMakeLists.txt
  flang/test/Driver/linker-flags.f90

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